NXP NTAG® 5 switch Reference guide

Brand: NXP

Model: NTAG® 5 switch

Type: Reference guide

This manual is also suitable for

RM00221

NTAG 5 - Android application development

Rev. 1.1 — 7 May 2020 Reference manual

531811 COMPANY PUBLIC

Document information

Information Content

Keywords NTAG 5, Android, ISO/IEC 15693, NFC, Pass-Through, PWM, GPIO, I2C

Master

Abstract This application note describes the usage of the Android application

developed to interact with the NTAG 5. There are four different use cases

defined to explore some of the new features added in this product.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 2 / 41

Revision history

Rev Date Description

v.1.1 20200507 • Figures updated

• Editorial changes

v.1.0 20200109 First official released version

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 3 / 41

1 Introduction

1.1 Objective

This document aims to describe the main functionalities of the Android application that

demonstrates several features of the NTAG 5 tag.

The Android application is divided in four use cases. This document describes each use

case in detail, presenting the most important parts of the code snippets.

1.2 Target audience

This document is intended for Android developers who are working with the NTAG 5.

NXP has created a reference Android Application to demonstrate four different use cases

of the new tag. Thus, an Android and Java background is needed in order to have a

complete understanding of the document.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 4 / 41

2 NTAG 5 overview

2.1 General description

NTAG 5 is ISO/IEC 15693 and NFC Forum Type 5 Tag compliant IC with an EEPROM,

SRAM and I

C host interface. This ensures information exchange with all NFC Forum

devices with a tap. With this ability, the tag offers a long-reading range and privacy due to

close proximity with mobile devices.

2.2 Features and applications

NTAG 5 is equipped with a reliable and robust memory. It has a 2048-byte EEPROM for

the user memory and a 256-byte SRAM for frequently changing data and Pass-Through

mode.

Regarding security there are several ways to protect the IC:

• 32-bit password to access the memory from NFC and I

C interfaces.

• Optional 64-bit password only to read/write the tag from NFC perspective.

• 128-bit AES mutual authentication from NFC perspective before doing memory

operations.

The NTAG 5 has a configurable contact interface with an I

C standard slave mode (with

100 kHz and fast 400 kHz operating frequencies) and a transparent I

C master channel.

Other interesting features in the contact interface are the configurable event detection

pin, two GPIO channels, two PWM channels and energy harvesting for low-power budget

applications.

Apart from these features, NTAG 5 has several innovative features such as Active Load

Modulation, NFC and I

C Disable, Privacy mode and DESTROY command.

Taking into account the IC features, it can be used in quite different applications:

Lighting, Smart home, Consumer, Industrial, Gaming or Smart metering.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 5 / 41

3 NTAG 5 – Use cases definition in Android App

3.1 Use cases definition

3.1.1 I

C master channel use case

This use case aims to show the I

C master channel feature of the NTAG 5. Using I

Master interface, I²C slave devices like sensors or memories can be connected to the

NTAG 5 without an external microcontroller. Using energy harvesting capability, an I²C

device can be powered by NTAG 5.

The response from the I

C slave to the commands will be stored in the SRAM and can be

read afterwards from NFC perspective.

In this use case, the I

C Master channel will be used to retrieve different data from the

combo sensor (FXOS8700CQ) included in the FRDM-KW41Z board. Since the MCU

is not used to retrieve the data from the sensor, this use case will not have a KW41Z

counterpart, only the Android application use case.

A sequence diagram of the use case can be seen in Figure 1.

It is important to remark that there are several I

C commands pre-defined to

communicate with the combo sensor (like sensor configuration, get accelerometer or get

magnetometer data). But there will also be the possibility to write custom commands to

retrieve other data from the sensor. The corresponding code snippet section will explain

the way these commands are formed.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 6 / 41

aaa-033486

NTAG5 I

C Active

NFC ON

Write in the SRAM the data

retrieved from sensor

Select NTAG

ACK

Config tag as I

C Master

(USE_CASE_CONFIG = 01b)

in TAG_CONFIG_1 (37h)

ACK

Configure FRDM-KW41Z

combosensor (set standby mode,

set hybrid mode and

finally active mode)

ACK

Send a predefined or custom

command to the combosensor

Send an I

C command addressing a

particular register in the sensor

Read SRAM

Android App KW41Z

Figure 1. I

C Master channel sequence diagram

3.1.2 GPIO use case

This use case aims to demonstrate the GPIO feature of the NTAG 5. In this feature, it is

possible to use the I

C lines as general-purpose input/output lines. The NTAG 5 has the

C lines (SCL/SDA) multiplexed with two GPIO/PWM lines.

These GPIO lines are managed via configuration/session registers. In the input mode,

the status of the pad will be available in the corresponding session bit. In the output

mode, the status can be written in the corresponding session bit.

There are two different channels available to be configured as GPIO. In this use case,

the channel 0 is configured as GPIO output to show the capabilities of the NTAG in this

mode and channel 1 is configured as GPIO input.

For a better understanding of the use case, a sequence diagram is shown in Figure 2.

First of all, the tag needs to be configured in GPIO/PWM mode. This is necessary

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 7 / 41

because the I

C lines and the GPIO/PWM lines are multiplexed and the tag needs

to select one of them. Once the IC is correctly configured, it is possible to read the

configuration for the two GPIO channels.

aaa-033487

NTAG5 I

C Active

NFC ON

Update GPIO_PAD1_IN_STATUS pin

Select NTAG

ACK

Config tag as GPIO/PWM

(USE_CASE_CONFIG = 10b)

in TAG_CONFIG_1 (37h)

ACK

Read Configuration (A3h, 37h)

GPIO Configuration (A3h, 37h)

Write Configuration (A3h, 37h)

ACK

Set GPIO_SCL_PAD_OUT_STATUS (A3h)

Read GPIO_PAD1_IN_STATUS (A0h)

Clear GPIO_SCL_PAD_OUT_STATUS (A3h)

Turn off LED4

Read PTC3 pin status

Turn on LED4

Update image according to pin status

Android App KW41Z

(OUTPUT use case)

(INPUT use case)

Figure 2. GPIO use case sequence diagram

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 8 / 41

3.1.2.1 GPIO output

In the GPIO output, the idea is to use the KW41Z board with the Android application.

First, it is necessary to flash the FRDM-KW41Z board with the corresponding binary

file. Then select the GPIO use case in the Android app menu. As previously stated, the

GPIO output is configured in channel 0 (this line is multiplexed with the SCL line of the

C interface).

In the Android app: there is a bulb image at the left side of the screen. This image is

clickable. Pushing the bulb image sets the output session register of the NTAG and then

LED4 in the FRDM-KW41Z board should be turned on. When clicking on ‘Clear GPIO

output’ button, the value in the session register will be cleared and both LED4 in the

board and bulb image in the apps will turn off.

Configuration: Channel 0 has the possibility to configure the slew rate of the signal. The

slew rate is the speed a signal goes from high to low (and the opposite way). At a higher

slew rate, it is possible to have some noise or distortion in the signal. At the frequency

the NTAG is operating, there is not a large impact regarding noise or distortion in the

signal. So it is recommended to configure the tag with High speed in the slew rate.

In the FRDM-KW41Z: the PTC2 pin is configured as an input pin and will trigger an

interrupt at rising and falling edges of the pin. When there is a rising edge (i.e. the output

session register in the NTAG is set to 1), the LED 3 will be illuminating in the KW41Z

board. At a falling edge, the register will be set to 0 and the LED 3 will be turned off.

3.1.2.2 GPIO input

As previously stated for the GPIO output use case, it is necessary to flash the FRDM-

KW41Z board with the GPIO binary file. Also select the GPIO use case in the Android

app menu.

The GPIO input use case has the opposite behavior of the GPIO output. In this case, the

Channel 1 is configured as input (SDA line of the I

C interface). In the Android app, it

will be necessary to configure the PAD and slew rate; the possible configurations will be

explained later.

In the Android app: There is a button image at the left side of the screen. This button is

not clickable. This button represents the status of the SW3 button on the FRDM-KW41Z

board. Each time the SW3 button on the FRDM-KW41Z board is pushed, the session

displayed as pushed. On the other hand, when releasing the SW3 button in the FRDM-

KW41Z board, the session register is cleared and the Android app will release the button

of the image.

Configuration: Channel 1 has the possibility to configure the slew rate of the signal

(the same recommendation as in Section 4.2.1 applies here) and the PAD configuration.

Regarding the PAD configuration, there are four options. The first option ‘Receiver

disabled’ will disable the GPIO pin in the tag and the GPIO communication with the

FRDM-KW41Z board will not be possible so this configuration should only be used in

case the user wants to disable GPIO input communication. The configurations ‘Plain

input with weak pull-up’ and ‘Plain input with weak pull-down’ are used when no external

resistor is connected to the board and to avoid a floating pin. In case of having an

external resistor connected to the board, it is recommended to use the ‘Plain input’

configuration and avoid weak pull-up/pull-down.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 9 / 41

In the FRDM-KW41Z: the PTC3 pin is configured as an output pin. Each time the SW3

button is pushed, the PTC3 pin will set the corresponding session register of the NTAG.

When SW3 button is released, the value of session register is cleared.

3.1.3 PWM use case

This use case aims to demonstrate the PWM generation capabilities of the NTAG 5.

PWM signals can be used to control electrical devices. In this case, the PWM generated

by the NTAG 5 will be used to control the brightness of two LEDs in the FRDM-KW41Z

board.

There are two different PWM lines available in the NTAG 5, as previously mentioned.

These PWM lines are multiplexed with the I

C and GPIO lines.

Before running this use case, it is necessary to flash the FRDM-KW41Z board with the

corresponding PWM binary file. In the Android app menu, the PWM use case option has

to be selected.

In the Android app: in this use case, the screen displays both PWM channels with the

same configuration options. As is shown in the sequence diagram in Figure 5, at first

it is necessary to configure the IC with GPIO/PWM use case. Once the tag is correctly

configured, it is possible to read the PWM configuration registers to check the existing

data. It is also possible to write these registers again to set new parameters to the PWM

channels.

The explanation of how the NTAG 5 configures a PWM signal can be found in section

8.3.4 in the product data sheet [Datasheet] and [Application Note].

In the FRDM-KW41Z: PTC2 and PTC3 pins are configured as PWM channel 0 and

channel 1 respectively. Both pins also have an interrupt to turn on/off LED3 and LED4

according to the input value of the corresponding pin.

A sequence diagram of the use case can be found in Figure 3.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 10 / 41

aaa-033489

NTAG5 I

C Active

NFC ON

Select NTAG

ACK

Config tag as GPIO/PWM

(USE_CASE_CONFIG = 10b)

in TAG_CONFIG_1 (37h)

ACK

Read Configuration (A3h, A4h, A5h)

PWM Configuration

Write Configuration (A3h, A4h, A5h)

Send PWM signal (LED3 and LED4

brightness will change accordingly)

Android App KW41Z

Figure 3. PWM use case sequence diagram

3.1.4 Pass-Through mode use case

This use case aims to show the Pass-Through mode functionality of the NTAG 5. The

Pass-Through mode allows a faster data transfer between RF and I

C interfaces using

the 256-byte SRAM.

The Pass-Through mode allows data transfer in two directions: from RF to I

C interface

and from I

C to RF interface. The NTAG 5 IC has an arbitration mechanism; this arbiter

locks the interface that has to communicate with the tag according to the Pass-Through

direction and SRAM_DATA_READY register. This mode uses the Event Detection pin of

the NTAG 5 to detect SRAM events.

Since the SRAM is activated in this use case, it is mandatory to connect the board to the

Vcc power supply.

More information about Pass-Through mode can be found in sections 8.1.4.1, 8.1.5 and

8.4.5 of [link Datasheet, boost Datasheet].

The use case is started in the Android app by clicking the ‘Start Demo’ button in the

Pass-Through view.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 11 / 41

The main functionality of this use case is to write the SRAM five times in a Pass-Through

direction, then configure it again to write five times in the opposite Pass-Through

direction and repeat this process until the ‘Stop Demo’ button is pushed in the Android

application.

The Pass-Through direction is automatically changed in the FRDM-KW41Z board each

time the Pass-Through mode has done five operations in the corresponding direction.

The default Pass-Through direction is RF->I

C. This direction is indicated with a blue

color in the LED4 in the FRDM-KW41Z board. When the tag is configured with I

C->RF

direction the LED4 will illuminate in green.

In the Android app: the usage of the Android app is straightforward in this use case. To

start using the demo, it is necessary to click the ‘Start Demo’ button in the Android view.

This will start writing in the RF->I

C direction; after a loop of five operations, the FRDM-

KW41Z board will toggle the direction to I

C->RF and the Android app will automatically

switch to this mode as well. The application will be looping between both Pass-Through

directions until the ‘Stop Demo’ button is clicked in the application.

Important: To run this use case correctly, it is necessary to connect the Event Detection

wire to the PTC17 pin in FRDM-KW41Z board.

3.1.4.1 RF→ I

C direction

This is the default direction of the Pass-Through mode for the FRDM-KW41Z board.

When the board is flashed with the corresponding binary file, a blue LED is turned on;

this blue LED indicates the Pass-Through direction.

At startup, the FRDM-KW41Z is waiting for a valid NFC connection. When the phone

taps the antenna, an event is triggered in the FRDM-KW41Z and the Pass-Through

configuration is written in the IC. In this direction, the SRAM is written via RF and read via

When the tag is configured, the arbiter locks the RF interface. When the RF interface is

locked the SRAM can only be written via RF. When the last byte of the SRAM has been

written, the arbiter releases the RF interface and locks the I

C interface, then the data

can be read via I

This use case is illustrated in Figure 4.

In the FRDM-KW41Z: The Pass-Through configuration sets the following data in

the TAG_CONFIG_1_REG: ARBITER_MODE = 10b, SRAM_MAPPING = 1b and

PT_TRANSFER_DIR = 1b. More information about the Pass-Through configuration can

be found in the product [link Datasheet, boost Datasheet].

In this Pass-Through direction, the FRDM-KW41Z board configures the

‘LAST_BYTE_WRITTEN_BY_RF’ event; this event is triggered when the last byte of the

SRAM has been written by RF. When this happens, the I

C interface is locked and the

SRAM_DATA_READY bit is set. This means that the SRAM is ready to be read via I

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 12 / 41

aaa-033488

ED_CONFIG = 0001b

(NFC Field present)

SRAM_DATA_READY

== 0b? OK!!

SRAM_DATA_READY

== 0b?

NTAG5 I

C Active

VCC_SUPPLY_OK == 1?

NFC_FIELD_OK ==1?

Write TAG_CONFIG_REG byte 1:

ARBITER_MODE = 10b,

SRAM_MAPPING = 1b,

PT_TRANSFER_DIR = 1b,

ED_CONFIG_REG = 0100b

NFC ON

ED pin LOW

ED pin HIGH

ACK

C Read (2000h - 203Fh)

ED pin LOW

Read tag status (10A0h)

WRITE_SRAM (D3h)

ACK

READ_STATUS_REG (A0h)

Tag status response

READ_STATUS_REG (A0h)

Tag status response

Android App KW41Z

RF LOCKED = 1b

C LOCKED = 0b

SRAM_DATA_READY = 0b

RF LOCKED = 0b

C LOCKED = 1b

SRAM_DATA_READY = 1b

RF LOCKED = 1b

Figure 4. Pass-Through RF→ I

C direction diagram

3.1.4.2 I

C → RF direction

When this direction is set in the FRDM-KW41Z board, a green light is turned on in LED4.

This use case is illustrated in Figure 5.

In the FRDM-KW41Z: The Pass-Through configuration sets in the

TAG_CONFIG_1_REG the following data: ARBITER_MODE = 10b, SRAM_MAPPING

= 1b and PT_TRANSFER_DIR = 0b. More information about the Pass-Through

configuration can be found in the product [Data sheet] and [Application note].

In this case, the firmware configures the ‘LAST_BYTE_READ_BY_RF’ event; this event

is triggered when the last byte of the SRAM has been read by RF. When this happens,

the I

C interface is locked and the SRAM_DATA_READY bit is cleared. This means that

the SRAM is ready to be written via I

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 13 / 41

aaa-033490

ED_CONFIG = 0001b

(NFC Field present)

SRAM_DATA_READY

== 1b? OK!!

SRAM_DATA_READY

== 1b?

NTAG5 I

C Active

VCC_SUPPLY_OK == 1?

NFC_FIELD_OK ==1?

Write TAG_CONFIG_REG byte 1:

ARBITER_MODE = 10b,

SRAM_MAPPING = 1b,

PT_TRANSFER_DIR = 0b,

ED_CONFIG_REG = 0011b

ED pin LOW

ED pin HIGH

ACK

C Write (2000h - 203Fh)

ED pin LOW

Read tag status (10A0h)

READ_SRAM (D2h)

SRAM data (256 bytes)

READ_STATUS_REG (A0h)

Tag status response

READ_STATUS_REG (A0h)

Tag status response

Android App KW41Z

RF LOCKED = 0b

C LOCKED = 1b

SRAM_DATA_READY = 0b

RF LOCKED = 1b

C LOCKED = 0b

SRAM_DATA_READY = 1b

NFC ON

Figure 5. Pass-Through I

C → RF direction diagram

3.1.5 ALM use case

The Active load Modulation use case is intended to show the capabilities of the NTAG

5 to change the ALM parameters through the FRDM-KW41Z and read the updated

configuration using the Android App. The parameters that can be configured are listed in

[Data sheet]. Figure 8 shows the diagram of this use case.

The configuration of ALM parameters is carried out using the Peek and Poke tool. Refer

to Section 6 for instructions on how to run the use case from this tool.

In Peek and Poke: Run the ALM use case and start by clicking the “Write configuration”

button. This will save the default values in the NTAG. Then, configure the parameters

using the text boxes and menus available and click on “Write Configuration” so the NTAG

can be configured.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 14 / 41

In Android App: Go to the ALM use case menu and click on the “Read ALM

Configuration”. The parameters will update accordingly to what has been configured in

Peek and Poke.

You can use the “Read Configuration” button of the ALM menu in Peek and Poke to

check that the configuration read matches the one in the Android App.

aaa-033491

NTAG5 I

C Active

Select NTAG

ACK

Config tag as I

C slave

ACK

Read ALM configuration

ALM configuration

Write Bytes @ ADDR 0x1040

Android App KW41Z Peek and Poke

Write ALM configuration

NFC ON

Figure 6. ALM use case sequence diagram.

3.2 User guide – NTAG 5 configuration

The NTAG 5 is configured in a different way depending on the use case to be

demonstrated. All the different configurations can be found in Table 1.

Table 1. NTAG 5 – NTAG 5 configurations

Use case

Configuration

Bits 5 and 4 in

TAG_CONFIG_1

NDEF message I

C Slave 00b

GPIO GPIO/PWM 10b

PWM GPIO/PWM 10b

C Master channel I

C Master 01b

Pass-Through mode I

C Slave 00b

More information about the tag configuration is illustrated in section 8.1.3.13 of the

product data sheet [Datasheet].

The Android application includes several options in the action bar regarding the tag

configuration. This action bar menu can be observed in Figure 7. There is one option to

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 15 / 41

read the current configuration in the tag and also another three options to configure the

tag in I

C slave, I

C master and GPIO/PWM modes.

Every time the tag is configured in a different mode it is necessary to reset the IC so

that the configuration takes place. The tag can be reset by removing its actual power

source (RF field or wired connection) and then reconnected.

Figure 7. Android app - Tag configuration

3.3 User guide – NFC connection with board

Before using the application, it is necessary to activate the NFC capabilities in the

smartphone (it is mandatory to have NFC capabilities in the phone).

Once the NFC communication is activated in the phone, the first step is to tap the phone

to the NTAG 5 board. When the connection is correctly established, a pop-up will be

displayed at the bottom of the screen saying that the connection has been successful

and the NTAG 5 board is ready to be used.

More details about how to use each use case can be found in the corresponding use

case explanation in Section 3.1.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 16 / 41

4 NTAG 5 – Use cases code snippets

4.1 General information and project structure

The main objective of this reference application is to clearly organize each use case to

ease code migration to other projects.

The Android Application has been created in Android Studio 3.0.1 with target SDK

version 27.

As mentioned above, it is structured in four separated modules. Each module is

developed in a separate Activity accessible from the main menu. In Figure 8, you can find

the project structure from Android Studio.

Figure 8. Android Studio project structure

The application has been designed following a layered structure: one layer for the NFC

communication (contained in BaseActivity class), another layer to operate with the action

bar (class BaseActionBarActivity) and finally the application logic and UI which are

contained in the different activities for each use case (PassThroughMode, GPIOActivity,

CMasterActivity and PWMActivity).

The class ‘RFCommand’ has been created in the package called ‘nfc’. This class

contains all the necessary RAW commands (following ISO/IEC 15693 spec) to

communicate with the tag. Also it has been necessary to develop a Parser class to get

and set all the tag parameters at a bit level. In the future, it is planned to have TapLinx

support for the NTAG 5. In the meantime, it is necessary to communicate with the tag by

using RAW commands.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 17 / 41

4.1.1 BaseActivity

As previously stated, BaseActivity is in charge of managing the NFC communication. At

first, when the application is opened, it is necessary to check if the NFC is enabled in the

phone; otherwise, the application warns the user to turn it on.

The application is restricted to work with ISO/IEC 15693 ICs. Hence, in case another IC

type is read, it will detect that it is not a vicinity IC and the application will not be able to

operate. In Figure 8 you can check how the IC is detected and selected.

Figure 9. Tag detection in BaseActivity

As commented in the code snippet in Figure 9, ISO/IEC 15693 ICs can work in two

different modes: addressed and selected.

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 18 / 41

In the selected mode, it is necessary to first select the IC using the desired UID. Once the

IC is selected, it is not necessary to include the UID in the subsequent commands.

In the addressed mode, the IC is not selected at the beginning and each command has

to include the UID of the desired IC.

This Android application works in selected mode.

BaseActivity class contains just one method to communicate with the IC using the

‘transceive’ method from the NFC API in Android. You can see this method in Figure 10.

Calling the ‘transceive’ method will return the IC response to the command. This

response is stored and returned each time the ‘sendCommand’ method is called.

Figure 10. Send command method in BaseActivity

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 19 / 41

4.1.2 BaseActionBarActivity

This activity will extend from BaseActivity and will only take care of the action bar.

In this application, the action bar has several options to configure the tag. It can be

configured to the different use cases: I

C Slave, I

C Master and GPIO/PWM. It can also

retrieve the current configuration in case the user does not remember the configuration

that was previously set.

4.1.3 MainActivity

This activity is very simple; it will contain a menu view to navigate through the different

use cases. As this activity extends from BaseActionBarActivity (which extends from

BaseActivity) it will be the link between the UI and NFC communication. Therefore, all the

particular activities for each use case will extend from this activity to have the possibility

to send NFC commands and update the UI in a simple way.

Figure 11 shows a screenshot of the main menu.

Figure 11. Android App Main menu

NXP Semiconductors

RM00221

NTAG 5 - Android application development

Reference manual Rev. 1.1 — 7 May 2020

COMPANY PUBLIC 531811 20 / 41

4.2 Use cases

4.2.1 I

C Master channel

The I

C Master Channel screen view is displayed in Figure 12. To use this feature, it is

necessary to configure the IC in I

C Master Mode. This configuration can be easily done

in the Android app by using the corresponding option in the Action bar.

Once the tag is correctly configured, there are two different ways to send I

C commands

to the tag: using a pre-defined command or writing a custom command. Each option will

be explained in a special section.

Figure 12. I

C Master Configuration view

4.2.1.1 I

C Master channel communication sequence

NTAG 5 has two commands to communicate in this mode: Write I

C and Read I

These commands will be explored in more detail in section 8.2.4.9 in the product [Data

sheet].

The I

C Address of the FXOS8700CQ combo sensor is 0x1F. This information will be

needed to form the Write and Read I

C Commands in the application.

The I

C Master communication has to follow the sequence explained below:

1. Send Write I

C Command (D4h): in the ‘I

C param’ byte. It is necessary to set

the ‘Disable Stop condition’ because right after a write I

C command, a read I

command will be sent. Finally, the register to be read from the combo sensor (Section

14 in the FXOS8700CQ [Data sheet]) has to be included in the ‘Data’ byte. More

information about this command can be found in section 8.2.4.9.1 in the NTAG 5

[Data sheet].

Page is loading ...

NXP NTAG® 5 switch Reference guide

Brand: NXP

Model: NTAG® 5 switch

Type: Reference guide

This manual is also suitable for

Download PDF

report

NXP NTAG® 5 switch Reference guide

This manual is also suitable for

NXP NTAG® 5 switch Reference guide

Related papers

Other documents